Audi RS Q8 4M

The Audi RS Q8 4M (from 2019) shares its platform with the Lamborghini Urus, Porsche Cayenne Turbo, and Bentley Bentayga — and shares their maintenance bills. The DCSA 4.0L TFSI V8 bi-turbo makes 600 hp, hits 60 mph in 3.7 seconds, and weighs 2.4 tonnes. Everything about this car is oversized, including the repair costs.

The turbo oil strainer is the hidden time bomb. A fine mesh upstream of both turbos clogs with carbon and oil sludge, starving the turbo bearings. No warning, no gradual onset — just turbo seizure. Single turbo replacement: $4,000–11,000. Both: catastrophic. Prevention: strict oil changes every 8,000–10,000 miles maximum with VW 508.00 spec oil. Audi’s extended intervals are optimistic.

The DCU 4.0L V8 in the SQ7/SQ8 has NHTSA recall 21V339000 for cylinder bore surface cracks — remedy is complete engine replacement. While this recall targets the SQ variant specifically, any used 4.0 TFSI V8 purchase should verify recall status by VIN. The 48V belt starter generator (BSG) fails across the range — NHTSA complaints document complete electrical shutdown and steering loss, with parts backordered for 6–8 weeks at one point. Replacement: $2,000–6,000.

The rest of the Q8 range: CREA 3.0L TFSI V6 is the most affordable to run — water pump failure at ~80,000 km ($800–2,000) is the main concern. DCBE 3.0L TFSI e PHEV adds HV battery degradation risk ($12,000–18,000 out of warranty) — avoid without CPO coverage. CVMD 3.0L TDI has a camshaft defect rated severity 5 ($3,500–20,000).

Vehicle-level: air suspension is standard and fails predictably — compressor $1,200–3,000, air spring pair $1,500–3,500. Brakes: a 2.4-tonne SUV with 600 hp destroys pads at above-average rates ($1,500–3,500 per service cycle). Panoramic roof drainage blockages cause interior water intrusion.

Test-drive checklist: Cold start: any turbo whistle or smoke? 48V system: warning lights after ignition? Air suspension: does it sit level after 30 minutes parked? Brakes: soft pedal after spirited driving? MMI: freeze or black screen on startup? Run VIN through NHTSA — recalls 21V339000 (engine) and 21V295000 (rear axle trailing arm) are safety-critical.

2026 market: RS Q8 new $138,300. Used 2021–2022 from $75,000–110,000. Q8 55 TFSI from $45,000. Insider pick: RS Q8 DCSA 2021–2022, under 40,000 miles, with documented oil changes at 8,000-mile intervals and turbo strainer service — the difference between a $90,000 bargain and a $90,000 disaster is one $800 maintenance step.